✨ feat: add new post creation script and theme update script, remove git-protect.list and sync-upstream.sh

- Deleted `README-zh.md` and `README.md` as they are no longer needed.
- Removed `git-protect.list` to streamline the synchronization process.
- Introduced `new-post.ts` script for easier blog post creation with default metadata.
- Added `update-theme.ts` script to simplify theme updates from the upstream repository.
- Updated content configuration to handle optional updated dates correctly.
- Adjusted pin values in theme guide documents to allow a range from 0-99 instead of 1-99.

scripts/update-theme.ts

@@ -0,0 +1,32 @@
+import { execSync } from 'node:child_process'
+import process from 'node:process'
+
+// pnpm update-theme
+
+// Check and set up the remote repository
+try {
+  execSync('git remote get-url upstream', { stdio: 'ignore' })
+}
+catch {
+  execSync('git remote add upstream https://github.com/radishzzz/astro-theme-retypeset.git', { stdio: 'inherit' })
+}
+
+// Update theme from upstream repository
+try {
+  execSync('git fetch upstream', { stdio: 'inherit' })
+
+  const beforeHash = execSync('git rev-parse HEAD', { encoding: 'utf8' }).trim()
+  execSync('git merge upstream/main', { stdio: 'inherit' })
+  const afterHash = execSync('git rev-parse HEAD', { encoding: 'utf8' }).trim()
+
+  if (beforeHash === afterHash) {
+    console.log('✅ Already up to date')
+  }
+  else {
+    console.log('✨ Updated successfully')
+  }
+}
+catch (error) {
+  console.error('❌ Update failed:', error)
+  process.exit(1)
+}